I'm pretty sure you're doing something else wrong. As you
can see below, MIME::Lite::TT::HTML is just passing through the
respective hashref to TT2. And TT2 can certainly handle HoHs (I've done
it many times).

Notice that I'm passing the hash reference "\%item_hoh" to TT2 via TmplParams whereas you passed $HoH. I need to generate my HoH on the fly. While your code works for a hard coded HoH, mine doesn't and I don't understand why.

None of the data is displayed in my emails when I use this code ... and I don't understand why. Thank you so much, I really appreciate your help, and I would be happy to buy you lunch because I'd really like to include this data in a table format in my emails :D.